Study on a Unified Fracture Mechanics Parameter Controlling Crack Growth Behavior and its Evaluation Method
控制裂纹扩展行为的统一断裂力学参数及其评价方法研究
基本信息
- 批准号:60460080
- 负责人:
- 金额:$ 4.22万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for General Scientific Research (B)
- 财政年份:1985
- 资助国家:日本
- 起止时间:1985 至 1986
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The crack energy density was proposed as a parameter which may describe all kinds of crack behavior in a unified form regardless of fracture types such as brittle-ductile fracture,fatigue fracture and creep fracture. In this research project,the way of expressing crack growth rate by the crack energy density and the evaluation method of thes parameter by numerical analysis are studied and,moreover,the initiation condition of creep crack growth is studied based on the crack energy density by using a newly-developed equipment for observing the deformation around a crack tip. The results are as follows;1. By considering the crack growth rates of ductile,fatigue and creep cracks from the standpoint of crack energy density,it is made clear that their growth rates can be described in a unified form by the increments of crack energy density at crack tip and fracture resistance expressed by crack energy density per unit time(per one cycle in case of fatigue) and the gradient of crack energy density distribution.2. The discontinuous crack model proposed as a model,which enablesus to evaluate the distribution of crack energy density as well as the value at crack tip,is extended so as to be able to deal with a creep problem and a new method to evaluate the crack energy density in this model by a path-independent integral is developed. The availability of the model is confirmed through the analyses of a standard problem.3. An equipment for observing the deformation around a crack tip out of the furnace is developed and the experiment of creep crack growth is carried out. The value of crack energy density evaluated by the method above at the time when a crack starts to grow suggests the existence of the critical value of crack energy density peculiar to the material.
提出了裂纹能量密度作为一个参数,它可以统一地描述各种裂纹行为,而不受脆韧性断裂、疲劳断裂和蠕变断裂等断裂类型的限制。本课题研究了用裂纹能量密度表示裂纹扩展速率的方法和用数值分析方法估算该参数的方法,并利用新研制的裂纹尖端变形观测装置,根据裂纹能量密度研究了蠕变裂纹扩展的起始条件。研究结果如下:1.从裂纹能量密度的角度考虑延性裂纹、疲劳裂纹和蠕变裂纹的裂纹扩展速率,表明它们的扩展速率可以用裂纹尖端裂纹能量密度的增量、用单位时间(疲劳情况下为一个循环)裂纹能量密度表示的断裂抗力和裂纹能量密度分布的梯度统一描述.本文将不连续裂纹模型推广到蠕变问题,提出了一种用路径无关积分计算裂纹能量密度的新方法。通过对一个标准问题的分析,验证了模型的有效性.研制了炉外裂纹尖端变形观测装置,并进行了蠕变裂纹扩展实验。当裂纹开始生长时,用上述方法计算的裂纹能量密度值表明存在材料特有的裂纹能量密度临界值。
项目成果
期刊论文数量(24)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Watanabe,K.& Sato,Y.: "An Evaluation of Creep Crack Parameter by Discontinuous Crack Model" Seisan-Kenkyu (in Japanese). 38-8. 370-373 (1986)
渡边,K.
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- 通讯作者:
Watanabe,K.,Azegami,H.& Hirano,Y.: "An Evaluation of the Fracture Resistance of a Stably Growing Crack by Crack Energy Density (5th Report,Comparison with the Fracture Resistances Evaluated by CTOD and CTOA)" Trans. of the JSME (in Japanese). 52-483. 2493
渡边,K.,阿泽上,H.
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渡辺,佐藤: 生産研究. Vol.38,No.8. 370-373 (1986)
佐藤渡边:生产研究,第 38 卷,第 370-373 期(1986 年)。
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- 影响因子:0
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Watanabe,K.& Sato,Y.: "A Fundamental Study on Discontinuous Crack Model (A General Constitute Equation and Evaluation of Crack Parameters)" Trans. of the JSME (in Japanese).
渡边,K.
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WATANABE Katsuhiko其他文献
WATANABE Katsuhiko的其他文献
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A GENEALOGICAL STUDY OF HINDU MANDIR ARCHITECTURE OF THE KATHMANDU VALLEY
加德满都谷地印度教寺庙建筑的谱系研究
- 批准号:
15560562 - 财政年份:2003
- 资助金额:
$ 4.22万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
INTERNATIONAL COMPARISN OF PROGRAMMES FOR RESTORATION OF WOODEN ARCHITECTURAL HERITAGE
木结构遗产修复方案的国际比较
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11650666 - 财政年份:1999
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$ 4.22万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Survey of Architectural Technique in a Buddhist Monastery of Nepal and its Preservation Measures
尼泊尔一座佛教寺院建筑工艺调查及保护措施
- 批准号:
02041073 - 财政年份:1990
- 资助金额:
$ 4.22万 - 项目类别:
Grant-in-Aid for international Scientific Research
Research on Figures of Nepalese Medieval Chok Architecture
尼泊尔中世纪Chok建筑造型研究
- 批准号:
01550483 - 财政年份:1989
- 资助金额:
$ 4.22万 - 项目类别:
Grant-in-Aid for General Scientific Research (C)
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